package commands

import (
	"errors"
	"fmt"
	"strings"

	"github.com/MichaelMure/git-bug/cache"
	"github.com/MichaelMure/git-bug/commands/select"
	"github.com/MichaelMure/git-bug/util/colors"
	"github.com/MichaelMure/git-bug/util/interrupt"
	"github.com/spf13/cobra"
)

var (
	showFieldsQuery	[]string
)

func runShowBug(cmd *cobra.Command, args []string) error {
	backend, err := cache.NewRepoCache(repo)
	if err != nil {
		return err
	}
	defer backend.Close()
	interrupt.RegisterCleaner(backend.Close)

	b, args, err := _select.ResolveBug(backend, args)
	if err != nil {
		return err
	}

	snapshot := b.Snapshot()

	if len(snapshot.Comments) == 0 {
		return errors.New("Invalid bug: no comment")
	}

	firstComment := snapshot.Comments[0]

	if showFieldsQuery==nil {
		// Header
		fmt.Printf("[%s] %s %s\n\n",
			colors.Yellow(snapshot.Status),
			colors.Cyan(snapshot.HumanId()),
			snapshot.Title,
		)

		fmt.Printf("%s opened this issue %s\n\n",
			colors.Magenta(firstComment.Author.DisplayName()),
			firstComment.FormatTimeRel(),
		)

		var labels = make([]string, len(snapshot.Labels))
		for i := range snapshot.Labels {
			labels[i] = string(snapshot.Labels[i])
		}

		fmt.Printf("labels: %s\n\n",
			strings.Join(labels, ", "),
		)

		// Comments
		indent := "  "

		for i, comment := range snapshot.Comments {
			var message string
			fmt.Printf("%s#%d %s <%s>\n\n",
				indent,
				i,
				comment.Author.DisplayName(),
				comment.Author.Email,
			)

			if comment.Message == "" {
				message = colors.GreyBold("No description provided.")
			} else {
				message = comment.Message
			}

			fmt.Printf("%s%s\n\n\n",
				indent,
				message,
			)
		}
	} else {
		unknownFields:=""
		err:=false
		for _, field := range showFieldsQuery {
			switch field {
				case "author": fmt.Printf("%s ",firstComment.Author.DisplayName())
				case "authorEmail": fmt.Printf("%s ",firstComment.Author.Email)
				case "createTime": fmt.Printf("%s ",firstComment.FormatTime())
				case "id": fmt.Printf("%s ",snapshot.Id())
				case "labels":
					var labels = make([]string, len(snapshot.Labels))
					fmt.Printf("%s ",strings.Join(labels,", "))
				case "shortId": fmt.Printf("%s ",snapshot.HumanId())
				case "status": fmt.Printf("%s ",snapshot.Status)
				case "title": fmt.Printf("%s ",snapshot.Title)
				default:
					unknownFields+=field+" "
					err=true
			}
		}
		fmt.Printf("\n")
		if err {
			return errors.New(fmt.Sprintf("Unsupported fields requested: %s\n",unknownFields))
		}
	}

	return nil
}

var showCmd = &cobra.Command{
	Use:     "show [<id>]",
	Short:   "Display the details of a bug",
	PreRunE: loadRepo,
	RunE:    runShowBug,
}

func init() {
	RootCmd.AddCommand(showCmd)
	showCmd.Flags().StringSliceVarP(&showFieldsQuery,"fields","f",nil,
		"Selects fields to display. Valid values are [author,authorEmail,createTime,id,labels,shortId,status,title]")
}